Portable speaker



FIG. 1 is a perspective view of a portable speaker, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is an opposite side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line portions of FIGS. 1, 4 and 6 are included to show unclaimed subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a portable speaker, as shown and described. 